No need to change plus heat range using EI

Posted by John T on September 24, 2012 at 05:01:33 from (216.249.82.117):

In Reply to: Ignition posted by Ellis Kinney on September 23, 2012 at 18:04:36:

Just because you switched to an EI is no reason a plug change is needed. If the one you have works well and isnt prematurely fouling theres no great need to change simply cuz a solid state switch (versus mechanical points) is being used to interrupt coil current. (EI doesnt change (much, likely none at all) a plugs operating temp.)

The operating "heat range" of a plug doesnt change based on whats being used to switch coil current. Ive had better luck with Autolite then Champion plugs, but again you dont need to change brands or heat ranges because you changed to an EI.

Many increase the plug gap if they use an EI and a high energy HV coil but its NOT required but if you do you need good high quality plug wires n cap n rotor since you have increased the firing and operating voltages. An EI and a high energy coil can increase the spark energy (E x I x Time) discharged across the gap when it fires but I wouldnt expect much if any at all HP increase although many report improved starting and idling performance when switching to an EI.

The voltage at which a plug fires is a function of the gap distance and the medium (compression and fuel) in which it fires so given the same conditions the stock coil with or without an EI switch will still fire at the same voltage. If you drastically increase the compression and are running exotic fuels (like race cars) then a HV coil (can produce higher voltage IFFFFFF necessary but still fires at same voltage as stock coil under same conditions) may be in order.

John T

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